Search the DJI site for mini 2 release notes. That document lists drone features improved by consecutive firmware upgrades. It also lists the required FLY app version to take advantage of those upgrades.
Read through it to the point where all it states afterwards is "...fixed known issues and bugs..." - scroll back to the last page where it states the inclusion of new features or specific bug fixes, then note the FLY app version - that's the last version built to serve a fully featured mini 2... which is:
Android: v.1.4.2
iOS: v.1.4.3
You'll find that older version archived on APKmirror which you can download directly to your (android) screen device.